Infiniti Q45 (FY33). Manual - part 207

DIAGNOSTIC PROCEDURE

INSPECTION START

1) Turn ignition switch “ON”.
2) Select “SELF-DIAG RESULTS”

mode with CONSULT-II.

3) Touch “ERASE”.

-------------------------------------------------------------------------------------------------------------------------------------- OR --------------------------------------------------------------------------------------------------------------------------------------

1) Turn ignition switch “ON”.
2) Select MODE 4 with GST.
3) Touch “ERASE”.

1) Turn ignition switch “ON”.
2) Erase the Diagnostic Test Mode

II (Self-diagnostic results)
memory.

PERFORM DIAGNOSTIC TROUBLE
CODE CONFIRMATION PROCEDURE.
See previous page.

Is the DTC P0605 (0301) displayed
again?

Yes

Replace ECM.

INSPECTION END

IDX

TROUBLE DIAGNOSIS FOR DTC P0605

Engine Control Module (ECM) (Cont’d)

EC-357

Manifold Absolute Pressure (MAP)/Barometric
Pressure (BARO) Switch Solenoid Valve

SYSTEM DESCRIPTION

Camshaft position sensor

Engine speed

ECM

MAP/BARO
switch solenoid
valve

Ignition switch

Start signal

Throttle position sensor

Throttle position

Vehicle speed sensor

Vehicle speed

This system allows the absolute pressure sensor to
monitor either ambient barometric pressure or
intake manifold pressure. The MAP/BARO switch
solenoid valve switches between two passages by
ON-OFF pulse signals from the ECM. (One passage
is from the intake air duct, the other is from the
intake manifold.) Either ambient barometric pres-
sure or intake manifold pressure is applied to the
absolute pressure sensor.

Solenoid

Conditions

For 5 seconds after turning ignition switch
“ON”

For 5 seconds after starting engine

More than 5 minutes after the solenoid valve
shuts OFF.

and

Throttle valve is shut or almost fully shut for
more than 5 seconds

and

Vehicle speed is less than 100 km/h (62
MPH).

SEF417Q

COMPONENT DESCRIPTION

The MAP/BARO switch solenoid valve switches its air flow pas-
sage according to the voltage signal sent from the ECM. When
voltage is supplied from the ECM, the MAP/BARO switch solenoid
turns “ON”. Then, the absolute pressure sensor can monitor the
ambient barometric pressure. When voltage is not supplied from
the ECM, the MAP/BARO switch solenoid valve turns “OFF”. Then,
the sensor monitors intake manifold pressure.

CONSULT-II REFERENCE VALUE IN DATA MONITOR MODE

Specification data are reference values.

MONITOR ITEM

CONDITION

SPECIFICATION

MAP/BARO SW/V

For 5 seconds after turning ignition switch “ON”

For 5 seconds after starting engine

BARO

More than 5 seconds after starting engine

MAP

TROUBLE DIAGNOSIS FOR DTC P1105

EC-358

ECM TERMINALS AND REFERENCE VALUE

Specification data are reference values and are measured between each terminal and ground.

CAUTION:

Do not use ECM ground terminals when measuring voltage. Doing so may result in damage to the
ECM’s transistor. Use a ground other than ECM terminals such as the body ground.

TER-

MINAL

NO.

WIRE

COLOR

ITEM

CONDITION

DATA

(DC Voltage)

MAP/BARO switch sole-
noid valve

Ignition switch “ON”

For 5 seconds after turning ignition switch
“ON”

Engine is running

For 5 seconds after starting engine.

Approximately 0V

Ignition switch “ON”

More than 5 seconds after turning ignition
switch “ON”

Engine is running

More than 5 seconds after starting engine

BATTERY VOLTAGE
(11 - 14V)

ON BOARD DIAGNOSIS LOGIC

Diagnostic Trouble

Code No.

Malfunction is detected when ....

Check Items

(Possible Cause)

P1105
1302

A) MAP/BARO switch solenoid valve receives the

voltage supplied though ECM does not supply
the voltage to the valve.

Harness or connectors
(MAP/BARO switch solenoid valve circuit is open
or shorted.)

MAP/BARO switch solenoid valve

B) There is little difference between MAP/BARO

switch solenoid valve input voltage at ambient
barometric pressure and voltage at intake mani-
fold pressure.

Harness or connectors
(MAP/BARO switch solenoid valve circuit is open
or shorted.)

Hoses
(Hoses are clogged, bent, kinked, disconnected,
not connected properly.)

Absolute pressure sensor

MAP/BARO switch solenoid valve

SEF261Y

DIAGNOSTIC TROUBLE CODE CONFIRMATION
PROCEDURE

Perform “Procedure for malfunction A” first. If the 1st trip DTC
cannot be confirmed, perform “Procedure for malfunction B”.
NOTE:
If “DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCE-
DURE” has been previously conducted, always turn ignition
switch “OFF” and wait at least 5 seconds before conducting
the next test.

IDX

TROUBLE DIAGNOSIS FOR DTC P1105

Manifold Absolute Pressure (MAP)/Barometric
Pressure (BARO) Switch Solenoid Valve
(Cont’d)

EC-359

Procedure for malfunction A

TESTING CONDITION:
Before performing the following procedure, confirm that bat-
tery voltage is more than 11V at idle.

1) Turn ignition switch “ON” and select “DATA MONITOR”

mode with CONSULT-II.

2) Start engine and let it idle.
3) Wait at least 10 seconds.
4) If 1st trip DTC is detected, go to “DIAGNOSTIC

PROCEDURE”, EC-364.

------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ OR ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Follow the procedure “With CONSULT-II” above.

SEF273Y

Procedure for malfunction B

1) Start engine and warm it up to normal operating tem-

perature.

2) Turn ignition switch “OFF” and wait at least 5 seconds.
3) Turn ignition switch “ON” again and select “DATA MONI-

TOR” mode with CONSULT-II.

4) Make sure that “FUEL T/TMP SE” is more than 0°C

(32°F).

5) Start engine and let it idle for at least 10 seconds.
6) If 1st trip DTC is detected, go to “DIAGNOSTIC

PROCEDURE”, EC-305.

1) Start engine and warm it up to normal operating tem-

perature.

2) Turn ignition switch “OFF” and wait at least 5 seconds.
3) Turn ignition switch “ON”.
4) Check that voltage between ECM terminal

and

ground is less than 4.2V.

5) Start engine and let it idle for at least 10 seconds.
6) Select “MODE 7” with GST.
7) If 1st trip DTC is detected, go to “DIAGNOSTIC

PROCEDURE”, EC-305.

SEF398W

1) Start engine and warm it up to normal operating tem-

perature.

2) Turn ignition switch “OFF” and wait at least 5 seconds.
3) Turn ignition switch “ON”.
4) Check that voltage between ECM terminal

and

ground is less than 4.2V.

5) Start engine and let it idle for at least 10 seconds.
6) Turn ignition switch “OFF”, wait at least 5 seconds and

then turn “ON”.

7) Perform “Diagnostic Test Mode II (Self-diagnostic

results)” with ECM.

TROUBLE DIAGNOSIS FOR DTC P1105

Manifold Absolute Pressure (MAP)/Barometric
Pressure (BARO) Switch Solenoid Valve
(Cont’d)

EC-360

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